If you feel scientific, you might do a torsional deflection test, as a baseline , before mod's begin. PITA bars,(diagonals) from front suspension/rail area, to load spreader plates, on the firewall, should help. These plates "might" be joined on the inside of firewall, with smaller diameter tubing, formed and welded to top or bottom corners, of the tunnel, to the rear kick-up area. Good Luck, roverman.